/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.mapreduce;

/**
 * Abstract <code>Mapper</code> class
 * <p>
 * User classes that implement `map' method should be derived from this class.
 */
public abstract class Mapper {
  /**
   * The <code>Context</code> passed on to the {@link Mapper} implementations.
   */
  public interface Context extends org.sss.mapreduce.Context {
  }
  /**
   * Called once prior to the calles of user-defined <tt>map</tt> methods.
   *
   * @param  context  <code>Context</code> object pased by SSS.
   * @throws Exception
   * @see    org.sss.mapreduce.Context
   */
  public void configure(Context context) throws Exception {
    //
    // DEFAULT IMPLEMENTATION DO NOTHING
    //
  }
}
